Magnetic brake.



PATENTED DEC. 17, 1907. P. G HALDY. MAGNETIC BRAKE. APPLIGATIOI rlmzn Jun: 11. 1901.

: Alta m I 0 9 1 7 1 6 u D D E T N. E T A D I. G. HALDY. MAGNETIC BRAKB. APPLICATION FILED mm: 17.1907.

FI LIIFLF.

At/arnejr n Nonms PETERS, INC.. Luna. WASHINGYON. D. C.

anti-l'ri ction rollers l 6.

UNITED STAGES PATENT oFFroE.

LEDERICK G. HAZDY, O15 STAMFORD, CONNECTICUT, ASSlGN'OR TO TI-1E YALE MAXUFAGTURING COMPANY, OF STAMFORD, (JONNECIIGUT.v

& TOWNE MAGNETIC BRAKE.

To all whom it mag concern;

.Be it known that I, FREDERICK G. lL-LLDY, of Stamford, in the county of Fairrield and State of Connecticut, have invented certain new and useful Improvements in Magnetic Brakes; and 1 do hereby declare the follow ing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it 'appertains to makeand use'the same.

Mty invention relates to an improvement in i'nagnetic brakes and it consists of means operated by a magnetic field energized by the magneto-motive force generated in resistance elements, for controlling a brake.

My invention. further consists in the parts and combinations of parts as will he more fully explained and pointed out in the claims.

. In the accompanying drawings, Figure 1V is a VlQVx' in side elevation, showing a part of the motor, and Pig. 2 is an end .view of same.

1 represents a portion of the motor frame of an electric motor, carrying bracket 2 to which the hood I}; is hinged at l. This hood carries a series of soft steel or iron studs 5, each carrying a tube 6 properly insulated, with resistance wire wound on i The studs 5 project from the ends of the spools adjacent-to the motor, and are approximately in line with the edge of hood adjacent to the motor frame 1. Hood 3 carries a post 7, carrying spring 8, the latter hearing at one end against the shoulder 9 on the post and at its'opposite endagainst the motor casing 1. This spring tends to norn'ialiy hold the hood away from the motor casing, thus producing an air gap 10 at one end and a much smaller gap 1 1 at the upper or hinged end.

Secured to the motor casing 1 and projecting into the hood, is the bracket 1.2,and secured to the outer plate of the hood 3 and projecting toward the motor frame is the bracket 13, the latter terminating in a plane below the free end of hracketlZ [and approximately under same.

Pivotally secured at its elhow bracket 12 is the bell crank lever 14, the short vertical arm of the latter being pivotally connected to the bracket 13, while the longer arm projects horizontally through slot in the face'of the hood and is provided at its free end with a cross head 1 5 carrying two 1 is the motor Passing through the hood shaft 17 carrying :11 HS lree and the. brake to the Specification of Letters Patent,

Application filed June 17, 1907. Serial No. 379.477.

Patented Dec. '17, 19 07..

pulley 13, which latter engaged by brake shoes 19 carried by the levers 20. These lei'ers are hinged to a boss on theilinotor and are preterably curved at their upper ends'to conform to the periphery ofthepulley 18,

the lower ends of the lovers being substai'b tially straight and each is provided near its lower free end with the camplates 21, having downwardly converging faces which are adapted to he engaged by the anti-friction rollers 16. I

Passing through the bra-lie levers 2t) is the rod 2'3 carrying springs 23 held in place by nuts, the said springs bearing agaii ist the outer faces of theleversfiZQ, and yieldingly holding the brake shoes in contact with the. pulley 1S, henoe when the hood 3 is in the position shown in Fig. 1, that is to saynvhen the hood is held awaylrom the motor frame 1 by the spring 8, the antiffriction rollers 16 are above, and out of cont act'with the-cam plates 21, thus permittingt-he springs 23 to force and'hold the brake shoes in contact with ,the pulley. As the hood swings inwardly toward the motor frame, the bellcranlolever 14 will be turned on its fulcrum in a direction toloroe the anti-.l'riction rollers 16 downwardly into contaot'with the cam plates 2]., and thus spread the levers ZUand release the pulley. As the hood swings out.- wardly from the motor traine the anti-frietion rollers 16 move upwardly on the cam plate 21, thus permitting the levers 20-to carry their brake shoes into cont act with the face of the pulley ll.

This hrakc is designed more particularly for motors for hoisting purposes, and \Vhllu it may be usedwith any motor I will refer to it simply in connection with. the plain series motor, which is the usual'type employedlfor hoisting. I

In the. operation of the device the hood 3 is so hinged, that when held away from the motor frame 1, an air gap 10 is formed, gradv inserted resistance elements 6, and these ele. ments are so wound and connected, that the magneto-motive i'orce. generated by thecurrent passing through. the resistance coils on zero, acomparatively small magneto-motive force is required to "maintain the same magnetic: pull, providing it is a complete iron cir cuit' as in'the .present instance; hence after the. series resistance has been cut out, ,comgaratively little shunted resistance would prouc'esu flicient'magnetic lines of force to hold.

hood. 3 against frame 1. in opposition to the springs 8 and-23, which as before explained :tend to increase the air gap and set the brake. V

In the ordinary solenoid brake the amount of wire.wou1id on the spool is determined by the magneto motive force necessary to ov ercom e the reluctance of the air gap when the.

cores are apart and the brake shoe set. In the present instance, the magneto-motive force is furnished without any extra coil, by means of magneto-motiveforce generated in theresistance element when the current is first. thrown on. .In some electric hoists a shunted resistance is employed for control' ling no load and light load speeds, which I propose to utilize for inaintainingthemagnetlc field after the series resistance has been i cut out.

It is evident that many slight changes -might be resorted to in the relative arrangemerit of parts shown and described without departing from the spirit and scope of my invention hence I would'have it understood that I do not wish to confine myself to the exact construction of parts shown and described, but,

Having fully described my invention what I claim as new and desire to secure by Letters- Patent, is

1. The combination. of an electric motor and a brake, of a movable electrical resist- -ance device interposed between the brake and motor and included in the circuit of the latter, said resistance device cooperating magnetically with the brake and cooperating mechanically with the brake to control the latter.-

2. The combination of an electric motor. a movable resistance device comprising coils havingiron cores tonniinera te with the motor structure, and a mechanical brake connected goth-and operated by said movable resistance evlce.

a movable plate or hood located in proximity thereto; of a resistance element comprising a series of coils having cores of ma etic mateto attract the motor case, and a bra e" actusaid movable plate or' hood.

ance element for electric motors and a brake for the motor shaft, the coils of said resist ance element having cores of magnetic material, a stationary element to be attracted by said cores, and means connecting the movable res'istarice element with the brake for controlling the operation: of the latter.

5." The combination of a-motor frame a resistance element hinged thereto, the coils of said resistance element having cores of magnetic material adapted to attract the, motor frame, a brake for the motor shaftand means connecting the hinged resistance element with the brake for controlling the movement of the latter.

- 6. The combination with a motor frame and a motor shaft, of a resistance element or rheostat hinged to the motor frame and having cores ofmagnetic material adapted to attract said frame, mearis normally tending to hold the resistance element out of contact with the frame, a brake for the motor shaft and means actuated by the movement of said resistance element for applying andreleasing the brake. I

7. The combination with a motor frame and a motor shaft, of a resistance element hinged to the motor frame and-having cores of magnetic material adapted to attract said frame, means normally tending to hold the resistance element out of contact with the frame, a brake carried by motor and normallybraking the motor shaft and means actuat'ed by the movements of the latter toward the motor frame for releasing the brake.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

Witnesses SCHUYLER Mnmu'm,

W. H. BERTINE.

It is hereby certified that in Letters-Patent No. 874,186, granted December 17 1907,

upon the application 'o-f FrederickG. Haldy, of Stamford, Connecticut, for an improve ment'in Magnetic Brakes, an error appears in the printed specification requiring correction, as follows: In line 49 ,'page 2,'the word brake that the proper correction has been made in the files and records of the Patent 0 and is hereby made in said Letters Patent.

should read motor; and

Slice,

. Signed and sealed this 14th day of January, A. D., 1908.

3. The combination with a motor case and ated b 4. T le combination of a movable resist' rial, thepoles of which are locate in osition zero, acomparatively small magneto-motive force is required to "maintain the same magnetic: pull, providing it is a complete iron cir cuit' as in'the .present instance; hence after the. series resistance has been cut out, ,comgaratively little shunted resistance would prouc'esu flicient'magnetic lines of force to hold.

hood. 3 against frame 1. in opposition to the springs 8 and-23, which as before explained :tend to increase the air gap and set the brake. V

In the ordinary solenoid brake the amount of wire.wou1id on the spool is determined by the magneto motive force necessary to ov ercom e the reluctance of the air gap when the.

cores are apart and the brake shoe set. In the present instance, the magneto-motive force is furnished without any extra coil, by means of magneto-motiveforce generated in theresistance element when the current is first. thrown on. .In some electric hoists a shunted resistance is employed for control' ling no load and light load speeds, which I propose to utilize for inaintainingthemagnetlc field after the series resistance has been i cut out.

It is evident that many slight changes -might be resorted to in the relative arrangemerit of parts shown and described without departing from the spirit and scope of my invention hence I would'have it understood that I do not wish to confine myself to the exact construction of parts shown and described, but,

Having fully described my invention what I claim as new and desire to secure by Letters- Patent, is

1. The combination. of an electric motor and a brake, of a movable electrical resist- -ance device interposed between the brake and motor and included in the circuit of the latter, said resistance device cooperating magnetically with the brake and cooperating mechanically with the brake to control the latter.-

2. The combination of an electric motor. a movable resistance device comprising coils havingiron cores tonniinera te with the motor structure, and a mechanical brake connected goth-and operated by said movable resistance evlce.

a movable plate or hood located in proximity thereto; of a resistance element comprising a series of coils having cores of ma etic mateto attract the motor case, and a bra e" actusaid movable plate or' hood.

ance element for electric motors and a brake for the motor shaft, the coils of said resist ance element having cores of magnetic material, a stationary element to be attracted by said cores, and means connecting the movable res'istarice element with the brake for controlling the operation: of the latter.

5." The combination of a-motor frame a resistance element hinged thereto, the coils of said resistance element having cores of magnetic material adapted to attract the, motor frame, a brake for the motor shaftand means connecting the hinged resistance element with the brake for controlling the movement of the latter.

- 6. The combination with a motor frame and a motor shaft, of a resistance element or rheostat hinged to the motor frame and having cores ofmagnetic material adapted to attract said frame, mearis normally tending to hold the resistance element out of contact with the frame, a brake for the motor shaft and means actuated by the movement of said resistance element for applying andreleasing the brake. I

7. The combination with a motor frame and a motor shaft, of a resistance element hinged to the motor frame and-having cores of magnetic material adapted to attract said frame, means normally tending to hold the resistance element out of contact with the frame, a brake carried by motor and normallybraking the motor shaft and means actuat'ed by the movements of the latter toward the motor frame for releasing the brake.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

Witnesses SCHUYLER Mnmu'm,

W. H. BERTINE.

It is hereby certified that in Letters-Patent No. 874,186, granted December 17 1907,

upon the application 'o-f FrederickG. Haldy, of Stamford, Connecticut, for an improve ment'in Magnetic Brakes, an error appears in the printed specification requiring correction, as follows: In line 49 ,'page 2,'the word brake that the proper correction has been made in the files and records of the Patent 0 and is hereby made in said Letters Patent.

should read motor; and

Slice,

. Signed and sealed this 14th day of January, A. D., 1908.

3. The combination with a motor case and ated b 4. T le combination of a movable resist' rial, thepoles of which are locate in osition Letters Patent No. 874,186-

It is hereby certified that in Letters Patent No. 874.186, granted December 17. 1907, upon the application of Frederick G. Haldy, of Stamford, Connecticut, for an improvement in Magnetic Brakes, an error appears in the printed specification requiring correction, as follows: In line 49, page 2, the word brake should read motor; and that ihe proper correction has been made in the files and records of the Patent rice, and is hereby made in said Letters Patent.-

Sigued and sealed this 14th day of January, A. D., 1908. 

